Fuel supply system for internal combustion engines



F. C. MOCK.

FUELSUPPLY SYSTEM FOR INTERNAL COMBUSTION ENGINES. .APPLICATION FILED act. 24. 1913. RENEWED FEB. 25, 1913.

1,315,231. Patented Sept. 9, 1919.

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MM-44m). I Fran/J1 ULMOOJG F. C. MOCK.

FUEL SUPPLY SYSTEM FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED OCT. 24. m3. RENEWEDYFEB. 25. 1918.

,3 1 5 ,23 1 Patented Sept. 9, 1919.

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Wj f/nesses: [raven/$07 WM E B 6 Frank UMOflJU M WMMMM W'% I/ f Attorneys v UNITED STATES PATENT OFFICE.

FRANK C. MOCK, OF CHICAGO, ILLINOIS, ASSIGNOR TO STROMBERG MOTOR DEVICES COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FUEL-SUPPLY SYSTEM ron m'rnnnnn-comnusrron ENGINES.

Specificationof Letters Patent.

Patented Sept. 9, 1919 Application filed October 24, 1913, Serial No. 797,017. Renewed February 25, 1918. Serial No. 219,156.

To all whom it may concern:

Be it known that I, FRANK C. Moon, a

citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented. a certain new and useful Improvement in Fuel Supply Systems for Internal-Combustion Engines, of which the following is a full, clear, concise, and exact description, reference beinghad to. the accompanying drawings, forming a part of this specification. My invention relates to an improved fuel supply system for internal combustion engines of the constant pressure type and it is particularly applicable to internal combustion engines in which a carburetor is employed for producing a proper vapor fuel mixture for operating the engine.

In the past, various systems have been emvployed for supplying fuel to carburetors for internal combustion engines, as, for example, systems in which pressure is applied to'the surface-of the liquid fuel inth'e fuel tank for the purpose of forcing the fuel through the piping connecting said tank with the carbureter. Systems of this kind have been open to the serious objection that the entire fuel system must be made air-tight so as to avoid leaks, including the closures for the openings used to fill the fuel tanks and, in

practice, it is found very difiicult to main-. tain such a condition. In other systems, it

conditions, the operation of the engine is interrupted by air getting into the fuel sup ply pipe instead of the liquid fuel, as a result of which the engine frequently would sto IE is the particular purpose of my invention to provide an improved means for maintaming a supply of liquid fuel in a receptacle at or above the level of the carburetor so that liquid fuel will be maintained at all times in the receptacle and that the operation of the supply mechanism will be positive for all varying conditions of operation of the engine. 1

at 1 and is provided with an intake manifold 2 in the supply passage 3, of which a- Ventuiri tube 4 is formed. A carburetor 5 preferably having a. float-controlled or levelcontrolled valve to govern the supply of liquid fuel thereto is connected with the lower end of the supply passage 3 and this carbureter is connected by means of a pipe 6 with the bottom of the fuel receptacle 7. The receptacle 7 has connected with its top -a pipe 8 terminating in a nozzle 9 in the Venturi tube 4, so that the suction exerted by the engine will produce upon the nozzle 9 an aspirating effect, which will thereby produce a corresponding. suction in the pipe 8.

The receptacle 7 has located in its upper portion a smaller receiving receptacle 10, into which the liquid fuel is delivered from a pipe 11 extending to the fuel tank 12. A stop cook 13 is provided in the pipe 11 so that communication between the receptacle 7 and the tank12 may be interrupted when desired. The tank 12 is closed by means of a screw plug 14 through which an air Vent 15 is formed. i

The receiving receptacle 10 has mounted therein a siphon tube 16, the shorter leg of which terminates slightly above the bottom of the receptacle 10 and the longer leg of which extends through the'bottom, so as to discharge the contentsof the receiving receptacle 10 into the central portion of the receptacle 7, where the fuel is held when the valve 17 is closed and from which the fuel is discharged into the bottom part of the receptacle 7 when the valve 17 is opened. The siphon tube 16 is entirely contained within the receptacle 10 with the exception of the projecting portion of its longer leg,

so that the siphon may be wholly covered by the liquid fuel when the fuel has reached a level near the top of the receiving receptacle tank. The central portion of the receptacle 7 above the wall 18 contains a float 19 supported 'by an arm 20 from a pivot 21 in an offset portion extending from the receptacle The other side of the float 19 is connected by a loose joint with the lower end of the valve rod 22, the upper end of which passes through a guide 23 and terminates in a valve 24 arranged to engage the valve seat formed in the end of the pipe 8 when the float 19 is raised. The lower portion of the receptacle 7 is connected with the receiving receptacle 10 by the pipe 25, which terminates at its upper end in an aperture of restricted cross-section substantially in the plane of the bottom of the receiving tank 10 and, at its lower end, this pipe 25 projects into a cup 27 and is somewhat lower than the seat for the valve 17 L The cup 27 is supported in any suitable manner from the side wall of the receptacle 7 and is provided with a small aperture 28 in its bottom. An air vent 29 is connected with the lower portion of the receptacle 7. above the seat of the valve 17 and extends a sufficient height outside of the receptacle 7 so'that the liquid in the tube 29 will not at any time flow over the top of said tube, which is open to the atmosphere.

The operation of the mechanism described is as follows:

Starting with the condition of no fuel in the receptacle 7, the suction of the engine in starting will produce-a partial vacuum in the pipe 8 and, as the float 19 at this time is in its lowermost position, this partial vacuum is exerted upon the pipe 11, the stop cock13,having been opened to permit the fuel to flow from tank 12 into the receptacle 7. As a result of this condition, fuel .flows through the pipe 11 into the receiving receptacle 10 until it is at a suflicient level to cover the siphon tube 16. During this time, the valve 17 is closed, since its open position is sufliciently close to its seat so that the suction produced in the upper portion of the receptacle 7 moves the valve to its seat and holds it there. Any suitable means, as, for example, a toe 17 may be employed for preventing the opening of the valve 17 to a position to which it will not be-olosed by the suction. When the siphon tube 16 has been covered with fuel, it is filled and at once operates to discharge the contents of the receiving receptacle 10 intothe central portion of the receptacle 7, in which it is held by the closed valve 17 and, dependin upon the relative proportions of the centred portion of the receptacle 7, the float 19 and the receiving receptaclelO, one or more discharges through the siphon 16 will be required to lift the float 19 so as to move the valve 24 to a position to shut off the suction or partial vacuum in the pipe 8 from the upper portion of the rece tacle 7. The purpose of the siphon is to raw over a slug of gasolene torinsure closing of the valve 24. If no means for sending a slug of liquid were employed, that is if the feed to the float chamber were strictly dependent upon the suction in that chamber, a condition of equilibrium would eventually occur, where the valve 24: would be almost closed and the suction would be decreased to a point where the fuel would no longer rise in the pipe 11.

Enough fuel might not be drawn into the float chamber to dump through the valve 17, and there would be a dead standstill of operations, where the apparatus would be useless. The closed condition of valve 24 is maintained as long as the level of the liquid above the wall 18 of the receptacle 7 is sufficient to hold the float 19 in its upper position and, during this condition, the pressure in the upper portion of the receptacle 7 is equalized by air entering the upper portion of said receptacle, through the pipe 25, which action progresses somewhat slowly owing to the restricted orifice at the upper end of said pipe. It is to be understood that the lower portion of the receptacle 7, below .the wall 18, is maintained at all times at fuel remaining in the receiving receptacle 10 and the air is, therefore, carbureted to a certain degree so that when such air finds its way subsequently into the manifold 2 it exercises little, if any, retarding influence upon the operation of the engine.

The bleeder 25 and the atmospheric connection 29 are employed to prevent the occurrence of a condition of equilibrium-during the dumping of the gasolene through the valve 17. If the atmospheric connection and the bleeder were not employed, the valve 17 might attain a position, due to the balancing of suction and the weight of the gasolene above the same, where the suction would be not great enough to draw in more gasolene and the weight of the gasolene would be insuflicient to dump the valve. A slow leakage might occur and the apparatus would lack positiveness of operation. The bleeder prevents such a condition of balance and causes the valve 17 to be opened. After the same is opened the air from the connection 29 is drawn in, bubbles up through the descending gasolene and causes the action of dumping through the valve 17 to be rapid and positive.

When the pressure in the upper portion of the receptacle 7 has been made substantiallythe same as the pressure in the lower portion of said receptacle, the valve 17. which is of sufficient "weight so that it will not float in the liquid fuel, opens-and the fuel previously contained above the wall 18 flows into the lower portion of the receptacle 7 and the cup 27 is gradually filled through the small aperture 28. For this condition of the apparatus, the fuel flows through the pipe 6 to the carbureter 5, either under the influence of the head resulting from the receptacle 7 being above the carbureter or from the suction of the intake manifold, or both, and in this manner the fuel is supplied to the carburetor at a substantially constant pressure. When the fuel flows. from the central portion of the receptacle 7 to the lower portion of the recep-' tacle, the fioa-t19 drops and the valve 24 is again opened, which results in again establishing the partial vacuum in the upper portion of the receptacle 7, which again closes the valve 17, and the operation above described is repeated, with the exception that at this time, sincethe cup 27 contains liquid fuel, during the equalization of the pressure after the valve 24 is closed, the

liquid will be drawn through the pipe 25 during the equalization operation, and little or no air will pass from the lower portion of the receptacle 7 to the upper portion of saidreceptacle, depending upon the capacity of the cup .27, the size of the aperture 28 in its bottom, and the height of the liquid in the lower portion of the receptacle 7. It will beunderstood that the valve 17 is suiiiciently light so that it will close readily under the influence of the suction or partial vacuum produced in the upper portion of the receptacle 7 and that, on the other hand, when the pressures in the upper and lower portions of the receptacle 7 are substantially the same, it will open readily under the weight of the liquid restin upon it. It is essential that the valve 17 shall close at once when the partial vacuum is produced in the upper portion of' the re: ceptacle 7 to prevent air entering through the pipe 29, the lower port-ion of the receptacle 7 and through the valve 17, which action will supply air to the pipe 8 and interfere with the operation of the engine and also fail to produce the requisite partial vacuum upon theend of the fuel pipe 11. The aperture 28 in the bottom of the cup 27 serves to retain the liquid in the cup a sufficient length of time so that it is available during the periods of equalization of pressure to wholly or in part equalize the pressures between the two portions of the receptacle 7, by flowing upward through the pipe 25 into the receiving receptacle 10.

The upper end of the pipe 6 is preferably a short distance above the bottom of the receptacle 7 so that a small amount of liquid fuel will be retained in the receptacle 7 at all times and be available for starting the engine, which may be accomplished by means of a by-pass 30, provided with a stopcock 31 for permitting this remaining fuel to flow directly into the pipe 6 whenever the I the receiving receptacle 10 by an equalizing pipe 25 in substantiallythe manner that the corresponding parts are. arranged in Fig.

1. In this modified construction, the discharge compartment 7 is provided with an air vent pipe 29 and a discharge pipe 6,

there being a bypass 30 for the same. purpose as described above for corresponding parts. In this construction, however, the float 19 controls the valve 17 so thatthe valve is positively opened when the float is raised. To permit this operation, it is de s'irable that the float may move vertically a certain distance after the valve 24 is closed by the upward motion of said float. To'secure this result, the valve rod 22 is pivotally connected at its lower end with a lever 32 pivotally supported at 33 and pro-- videdwith a counterweight 34 sufficient to hold the valve 24 in its closed condition when the float 19 is raised. The lever 32is extended sufficiently to the right of the pivot 33 so that the float 19 when in its lower position, rests'upon the end of said lever without, however, being connected thereto,v as a result of which when the float is in its lower posi'ti 011-, the valve 24: is opened, since the weight of the float 19 is suflicient to raise the counterweight 34: and, when the float 19 is moved upward by the accumulation of'liquid in the central portion of the receptacle 7", the valve 24* is closed by the operation of the counterweight 34:, leaving the float 19 free to continue its upward motion to a certain extent. The float 19 is provided with an arm 35 extending to parts secured thereto is balanced with the valve 17 slightly away from its valve seat.

The collar 37 is preferably so disposed upon the valve rod 36 that, when the central portion of the receptacle 7 has little or no fuel" in it and the float 19 is in its lowermost position, the collar is engaged by the arm 35 so as to positively close the valve 17". As a result of the construction described, it will appear that for this modified arrangement, when the device is first operated, the valve 24* will be open and the float 19 will be in its lowermost position, thus holding the valve 17 in its closed position. -As a result, fuel will flow into the receiving receptacle 10? from the pipe 11 and, in due course, the siphon tube 16 will be covered and the contents of the receiving receptacle will be discharged into the central portion of the receptacle 7*. Depending uponthe capacity of the receiving receptacle 10, the float 19 and the central portion of the receptacle 7 one or more discharges from the receiving receptacle 10 will be required to move the float 19 sufliciently to permit the counterweight 34 to close the valve 24*, and the parts are preferably so designed that the particular discharge from the receiving receptacle 1O which permits this operation is also sufiicient to move the float l9 vertically the additional amount required to bring the arm 35 into engagement with the 001131238 and thus positively open the valve 17 b to discharge the contents of the central portion of the receptacle 7 into the discharging chamber 7*. While the equalizingtube 25*" is provided in this modified structure and operates under certain conditions in substantially the manner shown and described above inconnection with Fig. 1, for many conditions it is not required, as the float 19 is sufiicient to positively operate the valve 17 against the suction produced in the upper portion of the receptacle 7'. For some conditions of extreme suction, however, it may be found impracticable to construct a float,

19, of sufiicient size to positively operate the valve 1'? in which case the equalizing tube 25 is desirable to reduce the vacuum produced in the upper portion of the receptacle to assist in the opening of the valve 17 b after the valve 24 is closed.

It will be understood that the liquid fuel usually employed in operating engines of this kind is gasolene or other similar liquid hydro-carbon, but my invention is equally applicable to the use of any liquid fuel, in

connection with which it is desired to sup-' ply the fuel to the engine directly or indirectly at constant pressure. It is to be noticed thatthe suctionproduced in the upper portion of the receptacle is dependent not only upon the vacuum produced by the engine in the intake manifold, but that it also depends upon the velocity of the flow of the fuel mixture through the Venturi tube, connecting the carburetor with the intake manifold, due to the aspirator action float to act positively upon the valve controlling the communication between the suction pipe and the upper portion of the re ceptacle of the device, so that said valve will be closed positively and remain closed for a definite intervalso that theliquid contained in the central. portion of the receptacle may be discharged into the lower part of the receptacle rapidly and completely, which produces an equally positive 0 eration of the float in the reverse direction, thus' establishing positively an open condition of the suction valve. As far as I am aware I am the first to produce this positive operation of themechanism in connection with a device of this kind, so that a definite and considerable quantity of liquid fuel is positively delivered to the portion of the receptacle communicating with the delivery pipe by each operation of the mechanism,

as a result of which the device is positive and reliable in its' operation in contradis tinction to the unreliable operation of devices in which the opening and closing of the suction valve is rapid so that the liquid fuel is supplied to the delivery pipe slowly and frequently in too small quantity. Furthermore, as far as I am aware, I am the first to produce a device of the kind described in which the valve mechanism between the upper and lower portions of the receptacle is positively operated by the float mechanism.

While I have shown my invention in the particular embodiments above described, I do not, however, limit myself to these particular constructions, as I may employ many equivalent constructions without departing from the spirit of my invention;

l/Vhat I claim is:

1. In a fuel supply system for internal combustion engines, the combination of a' receptacle divided into upper and lower compartments, a discharge valve for separating said compartments, a receiving receptacle in the upper portion of the upper compartment, a siphon tube disposed in the receiving receptacle with one end projecting below the bottom of said receiving receptacle, a float in the upper compartment, a suction pipe in the upper compartment, a fuel supply pipe in the upper compartment extending to the receiving receptacle, a discharge pipe extending from the lower compartment, an equalizing connection between the lower compartment and the receiving receptacle, an air-vent pipe extending from the upper portion of the lower compartment vertically toward the top of the receptacle, a fuel supply tank connected with the fuel supply pipe, an intake manifold, a carbureter, a- Venturi tube connecting the carbureter and manifold, a nozzle in the Venturi tube connected with the suction pipe, a' feed connection extending from the carbureter to said discharge pipe, a float below said receiving receptacle and a valve for said suction pipe controlled by said float.

2. In a fuel supply system for internal combustion engines, the combinationof a pipe controlled by the depth of liquid in the upper compartment, mechanism for transferring the liquid from the upper compartment to the lower compartment, a fuel supply tank connected with the fuel supply pipe, an intake manifold, a carbureter, a Venturi tube connectin the carbureter and manifold, a nozzle in t e Venturi tube connected with the suction pipe, and a feed connection extending from the carbureter to said discharge pipe.

3. In a fuel supply system for internalv combustion engines, the combination of a casing divided into upper and lower compartments,'a receiving receptacle in the upper compartment, mechanism controlled by the filling of the receiving receptacle to dis charge substantially all of its contents into the upper compartment, a fuel supply pipe extending to theupper com artment for filling the receiving receptac e, a suction pipe communicating with the upper compartment, a discharge pipe communicating with the lower compartment, devices for interrupting communication withv the suction pipe controlled by the depth of liquid in the upper compartment, mechanism for transferring the liquid from the upper compartment to the lower compartmenhwhe n communication with the suction pipe is interrupted, a fuel supply tank connected with the fuel supply pipe, an intake 1na n1- fold, a carbureter, a Venturi tube connecting the carbureter and manifold, a nozzle 1n the Venturi tube connected with the suction pipe, and a feed connection extending from the carbureter to said discharge plpe.

4. In a fuel supply system for internal combustion engines, the combination of a I casing divided into upper and lower compartments, a receiving receptacle in the upper compartment, a siphon 1n the recelv ng receptacle having one of its legs extending through the bottom of said receiving receptacle, a fuel supply pipe extending to the upper compartment for filling the receiving receptacle, a suction pipe communicating with the upper compartment, a discharge pipe communicating with the lower compartment, devices for interrupting communication with the suction pipe controlled by the depth of liquid in the upper compartment, mechanism for transferring the liquid from the upper compartment to the lower compartment, a fuel supply tank connected with the fuel supply pipe, an intake manifold, a carbureter, a Venturi tube connectmg the carbureter and manifold, a nozzle in the Venturi tube connected with the suc' tion pipe, and a feed connection extending from the carbureter to said discharge pipe.

5. In a fuel supply system for internal combustion engines, the combination of a casing comprising upper and lowercompartments, a receiving receptacle in the upper compartment, a fuelsupply pipe extending into the upper compartment for-filling the recelv'ing receptacle, a suction pipe connected wlth the upper compartment, a discharge pipe connected with the lower compartment,

a siphon pipe in the receiving receptacle havln'g one of its legs extending through the bottom of said receiving receptacle, a

float in the upper compartment, a valve closed by the operationof the float for interrupting communication between the suction pipe and the upper compartment, a valve controlling communication between the upper and lower compartments, a fuel supply tank connected with the fuel supply pipe, an intake manifold, a carbureter, a' Venturi tube connecting the carbureter and manifold, a nozzle in the Venturi tube connected with the suction pipe, and a feed connection extending from the carbureter to said discharge pipe. i

6. In a fuel supply system for internal combustion engines, the combination of a casing comprising upper and lower compartments, a receiving receptacle -in the upper compartment, a fuel supply pipe extending into the upper compartment for filling the receiving receptacle, a suction pipe connected with the upper compartment, a discharge pipe connected with the lower compartment, a siphon pipe in the receiving receptacle having one of its legs extending through the bottom of said receiving recept'acle and the other of its legs terminating above the bottom of said receiving receptacle, a float in the upper compartment, a valve controlled by the float for interrupting communication between the suction pipe and the upper compartment, a valve controlling communication between the upper and lower compartments, an equallzing plpe extending from the upper portion of the lower compartment to and terminating in a restricted aperture in the bottom of the receiving receptacle, a fuel supply tank connected with the fuel supply pipe, an intake manifold, a carbureter, a Venturi tube connecting the carbureter and manifold, a nozzle in the Venturi tube connected with the suction pipe, and a feed connection extending from the carbureter to said discharge pipe.

7. In a fuel supply system for internal combustion engines, the combination of a casing comprisingupper and lower compartments, a receiving receptacle in the upper compartment, a fuel supply pipe extendlng lnto the upper compartment for filling the receiving receptacle, a suction pipe connected with the upper compartment,a discharge pipe connected with the lower'compartment, a siphon pipe in the receivin receptacle having one of its legs exten ing through the bottom of said receiving receptacle, a float in the upper compartment, a valve controlled by the float for interrupting oommunicationbetween the suction pipe and the upper compartment, a valve for controlling communication between the lower compartment and the upper compartment,

an equalizing pipe extending from the lower compartment to the receiving receptacle, a

fuel supply tank connected with the fuel supply ipe, an intake manifold, a carbureter, a enturi tube connecting the carbureter and manifold, a nozzle in the Venturi tube connected with the suction pipe, and a feed connection extending from the carbureter to said discharge pipe.

8. In a fuel supply system for internal combustion engines, the combination of a casing comprising upper and lower compartments, a receiving receptacle in the upper compartment, a fuel supply pipe extending into the upper compartment for filling the receiving receptacle, a suction pipe connected with the upper compartment, a discharge pipe connected with the lower compartment, a siphon pipe in the receiving receptacle having one of its legs extending through the bottom of said receiving receptacle, a float in the upper compartment, a valve controlled by the float for interrupting communicationbetween the suction pipe and the upper compartment, a valve for controlling communication between the lower compartment and the upper compartment, an equalizing pipe extending from the lower compartment to the receiving receptacle, said equalizing pipe terminating in a restricted aperture 1n the receiving receptacle, acup in the lower compartment surrounding the lower end of said equalizingpipe, the lower end of said equalizing pipe being lower than the valve controlling communication between the upper and lower compartments, a fuel supply, tank connected with the fuel supply pipe, an intake manifold, a carbureter, a Venturi tube connecting the carbureter and manifold, a

nozzle in the Venturi tube connected with the suction pipe, and a feed connection extending from the carbureter to said discharge pipe.

9. In a'fuel supply system for internal combustion engines, the combination of a casing comprising upper and lower compartments, a receiving receptacle in the upper compartment, 9, fuel supply pipe extending into the upper compartment for filling the receiving receptacle, a suction pipe connected with the upper compartment, a discharge pipe connected with the lower compartment,

lower end' of saidequalizing pipe, the lower,

end of said equalizing pipe being lower than the valve controlling communication between the upper and lower compartments, an air-vent pipe extending from the lower compartment above the level of the valve controlling communication between the upper and lower compartments upward toward the topof said casing, a. fuel supply tank connected with the fuel supply ipe, an intake manifold, a carbureter, a enturi tube connecting the carbureter and manifold, a

nozzle in the Venturi tube connected with the suction pipe, and a feed connection extending from, the carbureter to said disharge pipe. 4

10. In a fuel supply system for internal combustion engines, the combination .of a casing comprising upper and lower 'compartments, a receiving receptacle in the upper compartment, a fuel supply pipe extending into the upper compartment for fillmg the receiving receptacle, a suction pipe connected with the upper compartment, a discharge pipe connected with the lower compartment, a siphon pipe in the receiving receptaclehaving one of its legs extending through the bottom of said receiving receptacle, a float in the upper compartment, a Valve closed by the operation of the flowt for interrupting communication between the suctlon pipe and the upper compartment, a valve controlling communication between the upper and lower compartments, devices operated by the float for opening the valve controlling communication between the upper compartment and the lower compartment after the operation of the suction-controlling 'valve, a fuel supply tank connected with the fuel supply pipe, an intake manifold, a carbureter, a Venturi tube connecting the carbureter and manifold, a nozzle in the Venturi tube connected with the suction pipe, and afeed connection extending from the carbureter to .said discharge pipe.

'11. In a fuel supply system for internal combustion engines, the combination of a casing comprising upper and lower compartments, a receiving receptaclein the upg per compartment, a fuel supply pipe exfor interrupting communication between the suction pipe and the upper compartment, a

valve controlling communication between the upper and lower compartments, devices operated by the float for opening the valve controlling communication between the upper compartment and the 'lower' compartment after the operation of the suction-controlling valve, said devices serving to positively close the valve controlling communication between the upper compartment and the lower compartment when said float is in its lowermost position, a fuel supply tank connected with the fuelsupply pipe, an intake' manifold a carbureter, a Venturi tube connecting the carbureter and manifold, a

nozzle in the Venturi tube connected with the suction pipe, and a feed connection extending from the carbureter to said discharge pipe.

12. In a fuel supply system for internal combustion engines, the combination of a receptacle divided into upper and lower compartments, a discharge valve for separating said compartments, a receiving receptacle in the upper portion of the upper compartment, a siphon tube disposed in the receiving receptacle with one end projecting below the bottom of said receiving receptacle, a float in the upper compartment, a suction connection in the upper compartment, a fuel supply connectionin the upper compartment extending to the receiving receptacle, a dischargeipipe extending from the lower compartment, an equalizing connection between the lower compartment and the receiving receptacle, an air-vent pipe extending from the upper portion of the lower compartment vertically toward the top the receptacle,'and means controlled by said float for operating said discharge valve.

13. In a fuel supply system for internal combustion engines, the combination of a casing'divided into upper and lower compartments, a receiving neceptaclein the upper compartment, mechanism controlled by the filling of the receiving receptacleto dis charge substantially all of its contents lnto 'the upper compartment, a fuel supply pipe partments, a receiving receptacle in the upper compartment, mechanism controlled by the filling of the receiving receptacle to discharge substantially all of its contents into the upper compartment, a fuel supply pipe extending to the upper compartment for filling the receiving receptacle, a suctionpipe communicating with the upper com-' partment, a discharge pipe communicating with the lower compartment, devices for in terrupting communication with the suction pipe controlled by the depth of liquid in the upper compartment, and mechanism for transferring the liquid from the upper compartment to the lower compartment when communication with the suction pipe isinterrupted. v .15. In a fuel supply system vfor internal combustion engines, the combination of a casingdivided into upper and lower compartments, a receiving receptacle in the upper compartment, a siphon in the receiving receptacle having one of its legs extending through the bottom of said receiving receptacle, a fuel supply pipe extending to the upper compartment for filling the receiving receptacle, a suction pipe communicating with the upper compartment, a discharge pipe communicating with the lower compartment, devices for interrupting communication with the suction pipe controlled by the depth of liquid in the upper compartment, and mechanism for transferring the liquid from the upper compartment to the lower compartment.

16. In a fuel supply system for internal combustion engines, the combination of a casing comprising upper and lowercompartments, a receiving receptacle in the upper compartment, a fuel supply pipe extending into the upper compartment for filling the receiving receptacle, a suction pipe cop 'nected wlth the upper compartment, a disthrough the bottom of said receiving recepflliw tacle, a float. in the upper compartment,

a valve closed by the operation of the float I casing comprising upper and lower compait ments, a receiving receptacle in the upper compartment, a fuel supply pipe extending into the upper compartment for filling the receiving receptacle, a suction pipe connected with the upper compartment, a discharge pipe connected with the lower compartment, a siphon pipe in the receiving receptacle having one of its legs extending through the bottom of said receiving receptacle and the other of its legs terminating above the bottom of said receiving receptacle, a float in the upper compartment, a valve controlled by the float for interrupting communication between the suction pipe and the upper compartment, a valve controlling communication between the upper and lower compartments, an equalizing pipe extendingfrom the upper, portion of the lower compartment to and terminatin in a restricted aperture in the bottom of t e receiving receptacle. a

18. In a fuel supply system for internal combustion engines, the combination of a casing comprlsing upper and lower compartments, a receiving receptacle in the up per compartment, a fuel supply pipe extending into the upper compartment for filling the receiving receptacle, a suction pipe connected with the upper compartment, a discharge pipe connected with the lower compartment, a siphon pipe in the receiving receptacle having one of its legs extending through the bottom of said receiving receptacle, a float in the upper compartment, a valve controlled by the float for interrupting communication between the suction pipe and the upper compartment, a valve for controlling communication between the lower compartment and the upper compartment, and an equalizing pipe extending from the lower compartment to the receiving receptacle.

19. In a fuel supply system for internal combustion engines, the combination of a casing comprising upper and lower compartments, a receiving receptacle in the upper compartment, a fuel supply pipe extending into the upper compartment for filling the receiving receptacle, a suction pipe connected with the upper compartment, a discharge pipe connected with the lower compartment, a siphon pipe in the receiving receptacle having one of its legs extendlng through the bottom of said receiving receptacle, a float in the upper compartment, a valve controlled by the float for interruptlower compartment andthe upper compartment, an equalizing pipe extending from the lower compartment to thereceiving receptacle, said equalizing pipe terminating in a restricted aperture in the receiving receptacle, and acup in the lower compartment surrounding the lower end of said equalizing pipe, the lower end of said equalizing pipe being lower than the valve controlling communication between the upper and lower compartments. w i

20. In a fuel supply system for internal combustion engines, the combination of a casing comprising upper and lower compartments, a receiving receptacle in the upper compartment, a fuel supply pipe extending into the upper compartment for filling the receiving receptacle, a suction pipe connected with the upper compartment, a discharge pipe connected with the lower compartment, a siphon pipe in the receiving re ceptacle having one of its legs extending through the bottom of said receiving receptacle, a float in the upper compartment, a valve controlled by the float for interrupting communication between the suction pipe and the upper compartment, a valve for controlling communication between the lower compartment and the upper compartment, an equalizing pipe extending from the lower compartment to the receiving receptacle, said equalizing pipe terminating in arestricted aperture in the receiving receptacle, and a cup in the lower compartment surrounding the lower end of said equalizing pipe, the lower end of said equalizing pipe being lower than the valve controlling communication between the upper and lower compartments, and an air-vent pipe extending from the lower compartment above the level of the valve controlling communication between the upper and lower compartments upward toward the top of said casing. 21. In a fuel supply system for internal combustion engines, the combination of a casing comprising upperand lower compartments, a receiving receptacle in the upper compartment, a fuel supply pipe extending into the upper compartment for filling the receiving receptacle, a suction pipe connected with the upper compartment, a discharge pipe connected with the lower ,compartment, a siphon pipe in the receivvalve controlling communication between the upper compartment and the lower com- 'partment after the operationof the suctioncontrolllng valve.

22. In a fuel supply system for internal combustion engines, the combination of a casing comprising upper and lower c0mpartments, a, receiving receptacle in the upper compartment, a fuel supply pipe 6X1 receptacle having one of its legs extending through the bottom of said receiving receptacle, a float in the upper compartment, a valve closed by the operation of the float for interrupting communication between the suction pipe and the upper compartment, a valve controlling communication between the upper and lower compartments, and devices operated by the float for opening the valve 'controlling communication between the upper and lower compartments, after the operation of the suction-controlling valve, said devices serving to positively close the valve controlling communication between the upper compartment and the lower compartment when said float is in its lowermost position.

23. In combination a liquid fuel supply receptacle, said receptacle having two chambers, a float in one of said chambers, a suction pipe communicating with said one chamber, a liquid receiving vessel, a fuel supply connection adapted to discharge into said vessel, means to dump the liquid from said vessel into the part of the receptacle containing said float, and valve'means controlled by said float for discharging said fluid to said other chamber.

24. In combination, an internal combustion engine, a carbureter connected with the intake of said engine a fuel supply tank below the level of said carbureter and having atmospheric pressure admitted thereto,

an intermediate chamber above the level of partments and said carbureter whereby the latter may be fed by gravity, said last named compartment having atmospheric pressure admitted thereto.

25. In combination, an internal combustion engine, a carbureter connected with the intake of said engine, a fuel supply tank below the level of said carbureter and hav, ing'atmospheric pressure admitted thereto,

' an intermediate chamber above the level of said carburetor, said chamber comprising two compartments having a valve controlled passageway therebetween, one of said compartments having a float therein positively operating said valve and being fed from said supply tank, said compartment having a connectlon from its top to said engine in take, whereby the pressure in said compartment may be reduced, another valve operated by said float and controlling said connection, and a connection between the other of said compartments and said carbureter whereby the latter may be fed by gravity, said last named compartment having atmospheric pressure admitted thereto.

In witness whereof, I hereunto subscribe my name this 22nd day of October, A. D., 1913.

FRANK C. MOCK'. Witnesses: i

ALBERT C. BELL,

AUGUST H. L. ARNDT. 

